Yes I know the best answer is don't do it. And that's what I'm probably going to recommend. But do to continuously shifting plans my parents now have an itinerary that spans 3 tickets. Sweet.

It goes something like this.
Jfk-Tpe on BR in C
Tpe-bkk on TG in C
And BKK-LPQ on Bangkok airlines.

I feel that the flights on BR/TG shouldn't be a big problem given that they are both star alliance but the last leg is what I'm concerned about. I've built in enough time for them to exit and reclaim if necessary but just wanted to see what yall thought.

Bangkok airlines is listed as an interline partner for both Thai and EVa so theoretically it might work. Practically I feel like it's going to be up to to the whims of the check in agent at jfk. Anyone ever do anything crazy like this before?

Thanks

Fdw